Replying to bump and add that my group is having issues as well. Two are on Mac (on the same network) and two on PC (different network than Macs but same network to each other). All playing through Steam. All with high speed internet. Only host has wired connection to router, everyone else uses WiFi. Host doesn't have any issues but others will lag and disconnect sporadically. We are going to try disabling the "Keep games saves in the Steam Cloud for Stardew Valley" option and see if that helps out at all. Lemme know if that helps you at all.